How to calculate variance in probability and statistics?

Calculating the variance in probability and statistics can be a bit hard when you do not know exactly what this is. Variance is known to be the measurement of the spread between the different numbers that can be found in the data set.

You would like to know this so that you can have a clearer idea regarding how far apart each number is from the mean and all the other numbers in the set.

*The formula that you need to use so that you can compute for variance is this: S2= ∑(xi – x)2 /n −1.

*You need to make sure that you have all of the details that are available so that computing for the variance will be easier to do.

Variance is related to the subject of math. It is the standard deviation's expectation of a random variable, which is found from the mean.

The following are the following steps to find the variance.

• First, the formula for variance must be known. This formula is Var(X) = Σx2p − μ2. In this formula, Var(X) is the variance.

• Next, plug the appropriate values into the variance.

• Once in the formula, square all of the values.

• Then, multiply each value by its probability.

• When they are all added together, one should have Σx2p

• The last step is to subtract Σx2p from μ2